1*0b57cec5SDimitry Andric //===-- subvti3.c - Implement __subvti3 -----------------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file implements __subvti3 for the compiler_rt library. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #include "int_lib.h" 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric #ifdef CRT_HAS_128BIT 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric // Returns: a - b 18*0b57cec5SDimitry Andric 19*0b57cec5SDimitry Andric // Effects: aborts if a - b overflows 20*0b57cec5SDimitry Andric __subvti3(ti_int a,ti_int b)21*0b57cec5SDimitry AndricCOMPILER_RT_ABI ti_int __subvti3(ti_int a, ti_int b) { 22*0b57cec5SDimitry Andric ti_int s = (tu_int)a - (tu_int)b; 23*0b57cec5SDimitry Andric if (b >= 0) { 24*0b57cec5SDimitry Andric if (s > a) 25*0b57cec5SDimitry Andric compilerrt_abort(); 26*0b57cec5SDimitry Andric } else { 27*0b57cec5SDimitry Andric if (s <= a) 28*0b57cec5SDimitry Andric compilerrt_abort(); 29*0b57cec5SDimitry Andric } 30*0b57cec5SDimitry Andric return s; 31*0b57cec5SDimitry Andric } 32*0b57cec5SDimitry Andric 33*0b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 34